At the end of a six-mile road in a dry valley in southern New Mexico, researchers are building a first-of-its-kind testing ground for the future. Here among the cottonwoods and coyotes, they are creating a city designed to serve as a living laboratory for the latest in cutting-edge technology, such as goods-delivering drones and roads filled with driverless cars. It’ll be identical to any other city except for one thing: No one will live there.